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LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
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Engine Control Module
DTC P0603 ECM POWER SUPPLYWiring Diagram Specification data are reference values and are measured between each terminal and ground.
CAUTION: Never use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
